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Apache
The Apache software license was created originally for the Apache Web server but now applies to all projects hosted under the Apache umbrella. Basically, the license does not have any restrictions on the redistribution of source code or binaries other than the inclusion of a required disclaimer statement.
It does require that if Apache software is used in a product the use must be acknowledged in the documentation for the product. The FSF recognizes the Apache license as a “free” license but also states that the Apache license is not compatible with GPL. FSF does not provide a specific reason why the Apache license is not compatible.
On the other hand, the Apache License FAQ states that the Apache license is compatible with GPL as far as they can tell and states that FSF has not provided them with an explanation for why it is not GPL compatible.
